1989111 has 4 divisors (see below), whose sum is σ = 2652152. Its totient is φ = 1326072.

The previous prime is 1989107. The next prime is 1989131. The reversal of 1989111 is 1119891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1119891 = 3 ⋅373297.

It is not a de Polignac number, because 1989111 - 2² = 1989107 is a prime.

It is a D-number.

It is a Duffinian number.

1989111 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331516 + ... + 331521.

It is an arithmetic number, because the mean of its divisors is an integer number (663038).

2^1989111 is an apocalyptic number.

1989111 is a deficient number, since it is larger than the sum of its proper divisors (663041).

1989111 is an equidigital number, since it uses as much as digits as its factorization.

1989111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663040.

The product of its digits is 648, while the sum is 30.

The square root of 1989111 is about 1410.3584650719. The cubic root of 1989111 is about 125.7630340878.

The spelling of 1989111 in words is "one million, nine hundred eighty-nine thousand, one hundred eleven".